Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
nang ho » nang hoc, nang co, tang ho
hieu ve » hieu va, hieu van
tu sach » thu sach, su sach, te sach
y nang » ky nang, ly nang, v nang
ho hoi » hoc hoi, hoa hoi, hoi hoi
su van » tu van, vu van
dao vi » dao voi, dao ve, dao va
vi cau » va cau, ve cau, di cau
ve cac » va cac, vien cac
su va » tu 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) or (thu hoach)) y nang ho hoi. hieu ve cac ((su va) or (su van)) dao vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) y nang ho hoi. hieu ve cac ((su va) OR (su van)) dao vi cau tren.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) y nang ho hoi. hieu ve cac ((su va) or (su van)) dao vi cau tren*.