Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hai chi » thai chi, tai chi, hai thi
hai chu » hai chau, hoi chu, hai phu
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
truc va » thuc va, trung va
van cau » van dau, van hau, van chat
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang

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 hoi. hieu van cau ((truc va) or (thuc vat)) thanh ((hai chu) or (hai chi)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. hieu van cau ((truc va) OR (thuc vat)) thanh ((hai chu) OR (hai chi)) tren.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. hieu van cau ((truc va) or (thuc vat)) thanh ((hai chu) or (hai chi)) tren*.