Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
tri nang » thi nang, tra nang, tri bang
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
nang ma » tang ma, sang ma, nang cao
tu sach » su sach, te sach, tu cach
van cam » van nam, van lam, van cau
cam cuc » cam xuc, cham cuu, pham cuc
cuc ban » cua ban, cac ban, cuu ban
ma hoi » mai hoi, xa hoi, ma hoa
di cua » doi cua, de cua, do cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) OR (tu sach)) tri nang ma hoi. hieu van cam cuc ban hanh ((di cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) tri nang ma hoi. hieu van cam cuc ban hanh ((di cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) tri nang ma hoi. hieu van cam cuc ban hanh ((di cua) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (tu sach)) tri nang ma hoi. hieu van cam cuc ban hanh ((di cua) or (dai cua)) tre*.