Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
cac truc » cau truc, cac tru, cac trung
thu sach » thuat sach, thuoc sach, thu hoach
lang hai » lang chai, lang thai, lang ha
lang dai » lang mai, lang chai, hoang dai
viec cac » vien cac, viec cua, viec lam
tu sach » su sach, te sach, tu cach
truc va » thuc va, thuc vat, trung va
nang ma » tang ma, sang ma, nang cao
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) ky nang ma hoa. hieu viec cac truc va ((lang dai) OR (lang hai)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang ma hoa. hieu viec cac truc va ((lang dai) OR (lang hai)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang ma hoa. hieu viec cac truc va ((lang dai) OR (lang hai)) cua tu".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang ma hoa. hieu viec cac truc va ((lang dai) OR (lang hai)) cua tu*.