Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
dau tren » dau tien, dat tren, dau tieng
lang xa » lang ha, dang xay, lang van
va chat » van chat, cao chat, hoa chat
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
ca tren » cau tren, cu tren, la tren
y lang » o lang, _ lang, tay lang
cua va » cua vat, chua va, cua van

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 y lang xa hoi. lieu ((va chat) OR (va phat)) cua va hanh va ((ca tren) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y lang xa hoi. lieu ((va chat) OR (va phat)) cua va hanh va ((ca tren) OR (dau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y lang xa hoi. lieu ((va chat) OR (va phat)) cua va hanh va ((ca tren) or (dau tren))".
• Adding a wildcard symbol may retrieve word variants: thuat sach y lang xa hoi. lieu ((va chat) OR (va phat)) cua va hanh va ((ca tren) or (dau tren))*.