Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
hat chau » ha chau, lai chau, hat nhan
vat danh » va danh, van danh, luat danh
hieu van » hieu va, thien van, lieu va
van cam » van nam, van lam, van cau
hoi cau » hoi chu, hoa cau, hoi cac
hoc cau » hoc cao, hoc cac, hoc can
nang ma » tang ma, sang ma, nang cao
vu sach » vu bach, su sach, vu khach
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 (hoc cau))) or (hat chau)) 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 (hoc cau))) OR (hat chau)) treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y nang ma hoi. hieu van cam thuc vat danh ((((hoi cau) OR (hoc cau))) or (hat chau)) treo".
• Adding a wildcard symbol may retrieve word variants: vu sach y nang ma hoi. hieu van cam thuc vat danh ((((hoi cau) OR (hoc cau))) or (hat chau)) treo*.