Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
thu sach » tu sach, thuat sach, thuoc sach
cham tuc » nham thuc, pham thuc, cham soc
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, va hanh
danh va » doanh va, hanh va, anh va
va va » va van, va vua, va vai
thiet » thieu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang cao hoi. hieu ve ((cham tuc) OR (tham thuc)) va danh va va thiet~.
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang cao hoi. hieu ve ((cham tuc) or (tham thuc)) va danh va va thiet*.