Perhaps you should try some spelling variations:
tang dan » tang van, tung dan, tang luan
hanh vai » hanh vi, hanh va, hanh tai
truc va » thuc va, thuc vat, trung va
vai cua » dai cua, hai cua, lai cua
tu sach » thu sach, su sach, te sach
ky tang » ky nang, ky dang, kho tang
dan hoi » dan hoc, dai hoi, van hoi
hieu vu » hieu va, hieu ve, hieu su
tu sac » tu cac, tu san, tu bac
vu cao » cu cao, va cao
tuc va » thuc va, tuc xa, duc va
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sac) OR (tu sach)) ky tang dan hoi. hieu vu cao ((tuc va) or (truc va)) hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu sach)) ky tang dan hoi. hieu vu cao ((tuc va) OR (truc va)) hanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) OR (tu sach)) ky tang dan hoi. hieu vu cao ((tuc va) or (truc va)) hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) OR (tu sach)) ky tang dan hoi. hieu vu cao ((tuc va) or (truc va)) hanh vai cua te*.