Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
dan hai » doan hai, dang hai, dan khai
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, mang may
sach v » sach va, sach y, sach 2
ve cam » ve cham, ve cac, va cam
va dan » ca dan, va dao, va dau
hai su » hai vu, lai su, hai so

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach v ((nang ma) OR (nang cao)) hoi. hieu ((ve cam) or (va cac)) duc va dan hai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v ((nang ma) OR (nang cao)) hoi. hieu ((ve cam) OR (va cac)) duc va dan hai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach v ((nang ma) OR (nang cao)) hoi. hieu ((ve cam) or (va cac)) duc va dan hai su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach v ((nang ma) OR (nang cao)) hoi. hieu ((ve cam) or (va cac)) duc va dan hai su triet*.