Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
hieu van » hieu va, thien van, lieu va
cam truc » cau truc, nam truc, lam truoc
vu sach » vu bach, su sach, vu khach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
mai hoi » mai khoi, dai hoi, lai hoi
van cam » van nam, van lam, van cau
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
vi cua » vai cua
di cua » doi cua, de cua, do cua

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 ly nang mai hoi. hieu van cam truc va hanh ((((vi cua) or (dai cua))) or (di cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ly nang mai hoi. hieu van cam truc va hanh ((((vi cua) OR (dai cua))) OR (di cua)) triet.
• Adding a wildcard symbol may retrieve word variants: vu sach ly nang mai hoi. hieu van cam truc va hanh ((((vi cua) or (dai cua))) or (di cua)) triet*.