Perhaps you should try some spelling variations:
duc manh » suc manh, duc anh, duc minh
thu sach » thuat sach, thuoc sach, thu hoach
hanh tai » thanh tai, hang tai, han tai
hanh lai » hanh lam, thanh lap, thanh loi
hieu van » hieu va, thien van, lieu va
tu sach » su sach, te sach, tu cach
van cau » van dau, van hau, van chat
cau duc » cao duc, cau luc, chu duc
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang
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: ((tu sach) OR (thu sach)) y nang ma hoi. hieu van cau duc manh ((hanh lai) or (hanh tai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang ma hoi. hieu van cau duc manh ((hanh lai) OR (hanh tai)) cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) y nang ma hoi. hieu van cau duc manh ((hanh lai) or (hanh tai)) cua te*".