Perhaps you should try some spelling variations:
hoc truc » hoc thuc, hoc trung, hoc thuoc
co trach » bo trach, co tranh, co tich
hanh dao » lanh dao, thanh dat, thanh dam
huu viet » huy viet, hung viet, khau viet
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang ha » dong ha, dung ha, lang ha
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
dao huu » do huu
ha hoi » hoa hoi, ha noi, xa hoi

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 ky dang ha hoi. hieu va ((hoc truc) or (co trach)) va hanh dao huu viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang ha hoi. hieu va ((hoc truc) OR (co trach)) va hanh dao huu viet.
• Adding a wildcard symbol may retrieve word variants: te sach ky dang ha hoi. hieu va ((hoc truc) or (co trach)) va hanh dao huu viet*.