Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cac » van hac, van cau, van bac
sach ty » sach y, sach tu, sach thu
su sach » so sach, vu sach
sang ma » tang ma, nang ma, sang tao
nang xa » nang x, lang xa, nang ma
cuu tre » cua tre, cau tren, cau treo
xac va » tac va, ac va, bac va
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((nang xa) or (sang ma)) hoi. hieu van cac ((xac va) or (thuc vat)) hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (sang ma)) hoi. hieu van cac ((xac va) OR (thuc vat)) hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) or (sang ma)) hoi. hieu van cac ((xac va) or (thuc vat)) hanh vi cuu tre*.