Perhaps you should try some spelling variations:
thieu nang » thien nang, thieu khang, thieu quang
van kham » van tham, van khai, van khao
hanh vai » hanh vi, hanh va, hanh tai
so sach » so sanh, bo sach, hoc sach
chua va » chuc va, chua may, chuan ha
co sach » bo sach, cuon sach, hoc sach
nang ma » tang ma, sang ma, nang cao
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
va kham » va cham, va khao, va tham
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) OR (co sach)) thieu nang ma hoi. hieu ((van kham) or (va kham)) chua va hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) thieu nang ma hoi. hieu ((van kham) OR (va kham)) chua va hanh vai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (co sach)) thieu nang ma hoi. hieu ((van kham) or (va kham)) chua va hanh vai cua te*".