Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hien bach » vien bach, hien hanh, dien sach
bo sach » co sach, hoc sach
sach ty » sach y, sach tu, sach thu
vai cua » dai cua, hai cua, lai cua
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, ma hoa
va dan » ca dan, va dao, va dau
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: bo sach ty nang ma hoi. hieu ((hien bach) OR (thien hach)) nuoc va dan ((vi cua) or (vai cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ty nang ma hoi. hieu ((hien bach) OR (thien hach)) nuoc va dan ((vi cua) OR (vai cua)) tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ty nang ma hoi. hieu ((hien bach) OR (thien hach)) nuoc va dan ((vi cua) or (vai cua)) tu*".