Perhaps you should try some spelling variations:
kham chua » kham pha
hanh vai » hanh vi, hanh va, hanh van
thu nang » thi nang, thu hang, thu bang
hieu van » hieu va, thien van, lieu va
van kham » van tham, va kham, van khai
hanh tai » thanh tai, hang tai, hinh tai
sach thu » sach thue, sach thieu, sach tham
so sach » so sanh, bo sach, co sach
han tai » hang tai, nhan tai, van tai
nang ma » tang ma, sang ma, nang cao
chua va » chuc va, chua may, chuan ha
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach thu nang ma hoi. hieu van kham chua va ((hanh vai) or (((hanh tai) OR (han tai)))) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thu nang ma hoi. hieu van kham chua va ((hanh vai) OR (((hanh tai) OR (han tai)))) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach thu nang ma hoi. hieu van kham chua va ((hanh vai) or (((hanh tai) OR (han tai)))) cua te".
• Adding a wildcard symbol may retrieve word variants: so sach thu nang ma hoi. hieu van kham chua va ((hanh vai) or (((hanh tai) OR (han tai)))) cua te*.