Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
hanh thai » nhanh thai, hinh thai, hanh tai
cham tuc » nham thuc, tham thuc, cham soc
thai cua » than cua, tai cuc, tri cua
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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) or (thu sach)) ky nang ma hoi. hieu ve ((cham tuc) or (pham thuc)) va hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang ma hoi. hieu ve ((cham tuc) OR (pham thuc)) va hanh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang ma hoi. hieu ve ((cham tuc) or (pham thuc)) va hanh thai cua tre*.