Perhaps you should try some spelling variations:
hanh van » thanh van, khanh van, hanh va
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang co » nang cao, nang doc, nang noi
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
truc va » thuc va, thuc vat, trung va
van cau » van dau, van hau, van chat
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang co hoc. hieu ve cham ((truc va) or (luc va)) hanh van cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang co hoc. hieu ve cham ((truc va) OR (luc va)) hanh van cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang co hoc. hieu ve cham ((truc va) or (luc va)) hanh van cau tren*.