Perhaps you should try some spelling variations:
cau trieu » cac trieu, cau triet, chua trieu
than tai » thanh tai, toan tai, nhan tai
hieu van » hieu va, thien van, hieu ve
sach ty » sach y, sach tu, sach thu
han tai » hang tai, nhan tai, van tai
tu sach » thu sach, su sach, te sach
hac xuc » chat xuc
ty nang » ky nang, ty xang, ty hang
xuc va » duc va, tuc va, luc va
x hoi » xa hoi, o hoi, x ho

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 x hoi. ((hieu van) OR (lieu va)) hac xuc va ((han tai) or (than tai)) cau trieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x hoi. ((hieu van) OR (lieu va)) hac xuc va ((han tai) OR (than tai)) cau trieu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang x hoi. ((hieu van) OR (lieu va)) hac xuc va ((han tai) or (than tai)) cau trieu".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x hoi. ((hieu van) OR (lieu va)) hac xuc va ((han tai) or (than tai)) cau trieu*.