Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cam thuc » am thuc, nam thuc, cam thu
vat manh » van manh, vat mang, vat thanh
manh hai » lanh hai, minh hai, thanh hai
cau tren » cu tren, dau tren, ca tren
su sach » so sach
vu sach » vu bach, vu khach
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
hai cau » hai chau, hai chu, hai hau

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) OR (vu sach)) ky nang xa hoi. hieu van cam thuc vat manh hai cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ky nang xa hoi. hieu van cam thuc vat manh hai cau tren".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ky nang xa hoi. hieu van cam thuc vat manh hai cau tren*.