Perhaps you should try some spelling variations:
sang tao » hang tai
tao khoi » tao hoi, thao khoa, lao khoa
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
hieu vu » hieu va, hieu ve, hieu su
vu kham » vu khanh
xuc va » luc va, xac va
tuc va » thuc va, truc va, tuc xa
cua tu » cua tuc, cua su, cua cu

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 ky sang tao khoi. hieu vu kham ((((xuc va) or (tuc va))) or (duc va)) hanh dai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang tao khoi. hieu vu kham ((((xuc va) OR (tuc va))) OR (duc va)) hanh dai cua tu.
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang tao khoi. hieu vu kham ((((xuc va) or (tuc va))) or (duc va)) hanh dai cua tu*.