Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuoc sinh
thuat sach » thuat lanh, thuat san
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
nang ma » tang ma, sang ma, nang cao
tac dao » toc dao, tac bao, tac dau
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) or (thuat sach)) ky nang ma hoi. hieu van ((tac da) or (tac dao)) va thanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (thuat sach)) ky nang ma hoi. hieu van ((tac da) OR (tac dao)) va thanh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (thuat sach)) ky nang ma hoi. hieu van ((tac da) or (tac dao)) va thanh vi cua vat*.