Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tinh lai » tinh lao, tinh hai, minh lai
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
su sach » so sach, vu sach
cua tre » cua te, cua triet, dua tren
va tinh » may tinh
van cac » van hac, van cau, van bac
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
cuu tre » cau tren, cau treo

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 (lang xa)) hoi. hieu van cac nuoc va tinh lai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (lang xa)) hoi. hieu van cac nuoc va tinh lai ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) or (lang xa)) hoi. hieu van cac nuoc va tinh lai ((cua tre) or (cuu tre))*.