Perhaps you should try some spelling variations:
sach tham » sach nha
sach thue » sach thu, sach thieu, cach thuc
hanh lam » thanh lap, hanh kem, hanh va
chang xu » chang xue, chao xu, thong xu
can hanh » ban hanh, van hanh, dan hanh
cau hoc » cau hoi, cau hoa, cao hoc
lam phu » lam chu, cam phu, am phu
hoc can » hoc dan, hoc cao, hoc cac
hieu ve » hieu va, hieu van
ve cau » ke cau, va cau, ve cac
xu ho » x ho, xu co, su ho

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 thue) or (sach tham)) chang xu ho. hieu ve cau hoc can hanh lam phu (tho OR theo)~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thue) OR (sach tham)) chang xu ho. hieu ve cau hoc can hanh lam phu (tho OR theo).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thue) or (sach tham)) chang xu ho. hieu ve cau hoc can hanh lam phu (tho OR theo)".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thue) or (sach tham)) chang xu ho. hieu ve cau hoc can hanh lam phu (tho OR theo)*.