Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, pham thu
nham thuc » nhan thuc, nam thuc, nham thu
su triet » su viet, su tien, ve triet
tinh hay » tinh hai, tinh ha, tinh hao
sach ty » sach tu, sach thu, xach tay
va tinh » may tinh
hieu va » lieu va, hieu qua
hang ca » hang va, nang cao, hang tai
ca hoi » cau hoi, cua hoi, xa hoi
hay su » hay cu

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 ty) or (sach y)) hang ca hoi. hieu va ((pham thuc) or (nham thuc)) va tinh hay su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) hang ca hoi. hieu va ((pham thuc) OR (nham thuc)) va tinh hay su triet.
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach y)) hang ca hoi. hieu va ((pham thuc) or (nham thuc)) va tinh hay su triet*.