Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cam thuc » am thuc, nam thuc, cam thu
vat danh » va danh, van danh, luat danh
hat nhan » ca nhan, tao nhan, van nhan
vu sach » vu bach, su sach, vu khach
nang ma » tang ma, sang ma, nang cao
van cam » van nam, van lam, van cau
hoi cau » hoi chu, hoc cau, hoa cau
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach y nang ma hoi. hieu van cam thuc vat danh ((hoi cau) or (hat nhan)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang ma hoi. hieu van cam thuc vat danh ((hoi cau) OR (hat nhan)) treo.
• Adding a wildcard symbol may retrieve word variants: vu sach y nang ma hoi. hieu van cam thuc vat danh ((hoi cau) or (hat nhan)) treo*.