Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
che quoc » che duoc, he quoc, che thuoc
chat duc » chat xuc, chat doc, chet duoc
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, ma hoa
di cua » dai cua, doi cua, de cua
cua te » cua tu

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)) ty nang ma hoi. hieu qua ((chat duc) or (che quoc)) va hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty nang ma hoi. hieu qua ((chat duc) OR (che quoc)) va hanh di cua te.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ty nang ma hoi. hieu qua ((chat duc) or (che quoc)) va hanh di cua te*.