Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
thien va » thien van, tien va, thien tai
hanh lai » hanh lam, hanh tai, thanh lap
ve triet » va trien, su triet
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
va cham » va chat, va tham
doc va » duoc va, hoc 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 ty nang cau hoi. thien va cham ((doc va) or (duc va)) ((hanh lai) or (thanh san)) ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang cau hoi. thien va cham ((doc va) OR (duc va)) ((hanh lai) OR (thanh san)) ve triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang cau hoi. thien va cham ((doc va) or (duc va)) ((hanh lai) or (thanh san)) ve triet*.