Perhaps you should try some spelling variations:
thuoc sach » nuoc sach, thuat sach, thuoc sinh
hoc sach » hoc sinh, hoc cac
dan vien » dan viet, nhan vien, danh viet
vien dai » hien dai
hoc anh » hoc nganh, hoc nhanh, ngoc anh
lang xa » lang ha, dang xay, lang van
qua cau » quan cau, qua cac, qua ca
truc va » thuc va, thuc vat, trung va
dai tro » vai tro, tai tro, dai tho
y lang » o lang, _ lang, tay lang
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) or (((hoc sach) OR (hoc anh)))) y lang xa hoi. hieu qua cau truc va dan vien dai tro~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (((hoc sach) OR (hoc anh)))) y lang xa hoi. hieu qua cau truc va dan vien dai tro.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) or (((hoc sach) OR (hoc anh)))) y lang xa hoi. hieu qua cau truc va dan vien dai tro".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (((hoc sach) OR (hoc anh)))) y lang xa hoi. hieu qua cau truc va dan vien dai tro*.