Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
thu sach » tu sach, thuat sach, thuoc sach
vien dai » hien dai
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
dai tuc » dai thuc, dai truc, dao tuc
va lang » va nang, hoa lang
tai cua » thai cua, tai cuc, dai cua
tuc va » thuc va, truc va, tuc xa

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 (su sach)) ky nang ma hoa. hieu vien dai tuc va lang ((tai cua) OR (tri cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (su sach)) ky nang ma hoa. hieu vien dai tuc va lang ((tai cua) OR (tri cua)) tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (su sach)) ky nang ma hoa. hieu vien dai tuc va lang ((tai cua) OR (tri cua)) tu".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) ky nang ma hoa. hieu vien dai tuc va lang ((tai cua) OR (tri cua)) tu*.