Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
chua tre » chua tri, cua tre, chua trieu
tang ma » mang may, tang van
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
hanh va » hang va, hanh vi
va chua » vua chua, ca chua, va chu
van cam » van nam, van lam, van cau
tac va » tac da, tac xa, tac ha
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty ((nang xa) or (tang ma)) hoi. hieu van cam ((tac va) or (tuc va)) hanh va chua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((nang xa) OR (tang ma)) hoi. hieu van cam ((tac va) OR (tuc va)) hanh va chua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((nang xa) or (tang ma)) hoi. hieu van cam ((tac va) or (tuc va)) hanh va chua tre*.