Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
tu sach » su sach, te sach, tu cach
nang ma » tang ma, sang ma, nang cao
van tan » van tuan, van ban, van tai
tan dat » dan dat, ban dat, tan dac
vai cua » dai cua, hai cua, lai cua
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (tu sach)) ky nang ma hoi. hieu van tan dat va thanh ((vi cua) or (vai cua)) vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ky nang ma hoi. hieu van tan dat va thanh ((vi cua) OR (vai cua)) vat.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (tu sach)) ky nang ma hoi. hieu van tan dat va thanh ((vi cua) or (vai cua)) vat*.