Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
kem phat » te phat, de phat, ve phat
tam phat » dao phat, tam than, van phat
nang ma » tang ma, sang ma, nang cao
van lam » van nam
lam luc » lao luc, lam duoc
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 luc va hanh ((kem phat) or (((tam phat) OR (va phat)))) trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ma hoa. hieu van lam luc va hanh ((kem phat) OR (((tam phat) OR (va phat)))) trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang ma hoa. hieu van lam luc va hanh ((kem phat) or (((tam phat) OR (va phat)))) trien".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ma hoa. hieu van lam luc va hanh ((kem phat) or (((tam phat) OR (va phat)))) trien*.