Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hieu vien » hieu viec, thieu nien, hieu tieng
thu sach » thuat sach, thuoc sach, thu hoach
lang tai » lang thai, hang tai, tang tai
cac thuc » cach thuc, cac thu, can thuc
thuc va » thuc vat, thuc dan, thuc day
tai cua » thai cua, tai cuc, tri cua
tu sach » su sach, te sach, tu cach
nang ma » tang ma, sang ma, nang cao
va lang » va nang, hoa lang
cua te » cua tu

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)) ky nang ma hoa. ((hieu vien) OR (hieu hien)) cac thuc va lang tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ky nang ma hoa. ((hieu vien) OR (hieu hien)) cac thuc va lang tai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (tu sach)) ky nang ma hoa. ((hieu vien) OR (hieu hien)) cac thuc va lang tai cua te*".