Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
tay lang » tai lang, tay quang, tham lang
tay tang » tay trung, tay quang, tay tieng
chau phi » chi phi, chau tho
hieu va » lieu va, hieu qua
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
hieu ve » hieu van
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, ha noi, xa hoi
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ((tay lang) OR (tay tang)) ha hoi. ((hieu ve) or (hieu va)) chau phi va hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((tay lang) OR (tay tang)) ha hoi. ((hieu ve) OR (hieu va)) chau phi va hanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ((tay lang) OR (tay tang)) ha hoi. ((hieu ve) or (hieu va)) chau phi va hanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach ((tay lang) OR (tay tang)) ha hoi. ((hieu ve) or (hieu va)) chau phi va hanh va cua tre*.