Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
thanh da » thanh dat, thanh dam, thanh dan
cau tren » cu tren, dau tren, ca tren
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cao hoi » cau hoi, co hoi, cao hoc
ham so » nam so, cham soc
so gia » so giai, so giao, ho gia
da cau » dat cau, va cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty nang cao hoi. ((hieu van) or (thien van)) ham so gia thanh da cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang cao hoi. ((hieu van) OR (thien van)) ham so gia thanh da cau tren.
• Adding a wildcard symbol may retrieve word variants: so sach ty nang cao hoi. ((hieu van) or (thien van)) ham so gia thanh da cau tren*.