Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
toc sach » hoc sach, doc sach, thuoc sach
vat hanh » vat thanh, van hanh, va hanh
nam thuc » nam thuoc, am thuc, nam tu
hanh ve » hanh vi, hanh va, hanh kem
tang ho » tang cho, tung ho, tang ha
ky tang » ky nang, ky dang, kho tang
hieu ve » hieu va, hieu van
ho hoi » hoc hoi, hoa hoi, hoi hoi
ve su » va su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) ky tang ho hoi. hieu ve ((nam thuc) or (nam thu)) vat hanh ve su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky tang ho hoi. hieu ve ((nam thuc) OR (nam thu)) vat hanh ve su triet.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky tang ho hoi. hieu ve ((nam thuc) or (nam thu)) vat hanh ve su triet*.