Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
kem phat » te phat, de phat, ve phat
tam phat » va phat, dao phat, tam than
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y nang ma hoa. hieu ((van lam) OR (van nam)) luc va hanh ((kem phat) or (tam phat)) trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ma hoa. hieu ((van lam) OR (van nam)) luc va hanh ((kem phat) OR (tam phat)) trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang ma hoa. hieu ((van lam) OR (van nam)) luc va hanh ((kem phat) or (tam phat)) trien".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ma hoa. hieu ((van lam) OR (van nam)) luc va hanh ((kem phat) or (tam phat)) trien*.