Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
tham luc » than luc, tham nuoc, tham thuc
dua tren » dung tren
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
va hanh » van hanh, va thanh, va danh
cu tren » tu tren
va tham » van tham, va cham, va thanh
luc va » duc va, tuc va, loc va

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 ((sang ma) OR (nang ma)) hoi. lieu va tham luc va hanh vi ((cu tren) or (dua tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y ((sang ma) OR (nang ma)) hoi. lieu va tham luc va hanh vi ((cu tren) OR (dua tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y ((sang ma) OR (nang ma)) hoi. lieu va tham luc va hanh vi ((cu tren) or (dua tren))*".