Perhaps you should try some spelling variations:
tham xuc » tham nuoc, tham thuc, pham duc
van phan » van phong, van thanh, luan phan
su sach » so sach, vu sach
nang xa » lang xa, nang ma, mang xa
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
van han » van hanh, van nhan, van hoan
tai va » thai va, mai va, tri va
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((nang xa) or (nang x)) hoi. hieu va tham xuc ((van han) OR (van phan)) tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (nang x)) hoi. hieu va tham xuc ((van han) OR (van phan)) tai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang xa) or (nang x)) hoi. hieu va tham xuc ((van han) OR (van phan)) tai va thiet".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) or (nang x)) hoi. hieu va tham xuc ((van han) OR (van phan)) tai va thiet*.