Perhaps you should try some spelling variations:
cau trieu » cac trieu, cau triet, chua trieu
thanh lap » thanh san, phan lap, thanh hai
hanh lai » hanh lam, hanh tai, thanh loi
hieu van » hieu va, thien van, lieu va
duc van » duc va, duc tan, duc manh
tu sach » thu sach, te sach, tu cach
van cam » van nam, van lam, van cau
cao hoi » cau hoi, co hoi, cao hoc
su sach » so sach, vu sach
cam duc » cam xuc, cao duc, pham duc
y nang » ky nang, ly nang, v nang

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 (su sach)) y nang cao hoi. hieu van cam duc van ((hanh lai) or (thanh lap)) cau trieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) y nang cao hoi. hieu van cam duc van ((hanh lai) OR (thanh lap)) cau trieu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) y nang cao hoi. hieu van cam duc van ((hanh lai) or (thanh lap)) cau trieu".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) y nang cao hoi. hieu van cam duc van ((hanh lai) or (thanh lap)) cau trieu*.