Perhaps you should try some spelling variations:
sach thue » sach thieu, sach tham, cach thuc
sach thu » sach thieu, sach tham, cach thuc
hanh via » hanh vi, hanh va, anh va
thuc dan » thuc hanh, hoc dan, thuc vat
cau tren » cu tren, dau tren, ca tren
lang xa » lang ha, dang xay, lang van
via cau » va cau, giua cau, bia chau
va lam » van lam, va lap
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: toc ((sach thu) or (sach thue)) lang xa hoi. lieu va lam ((tuc va) or (thuc dan)) hanh via cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach thu) OR (sach thue)) lang xa hoi. lieu va lam ((tuc va) OR (thuc dan)) hanh via cau tren.
• Adding a wildcard symbol may retrieve word variants: toc ((sach thu) or (sach thue)) lang xa hoi. lieu va lam ((tuc va) or (thuc dan)) hanh via cau tren*.