Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
tham thuc » pham thuc, tam thuc, thai thuc
cay vanh » cay lanh, cay xanh, cac van
vanh dai » van dai, vanh tai, lanh dao
su sach » so sach, vu sach
cao hoi » cau hoi, co hoi, cao hoc
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
cua su » qua su

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 v nang cao hoi. lieu va ((tham thuc) OR (nham thuc)) cay vanh dai cua su~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v nang cao hoi. lieu va ((tham thuc) OR (nham thuc)) cay vanh dai cua su".
• Adding a wildcard symbol may retrieve word variants: su sach v nang cao hoi. lieu va ((tham thuc) OR (nham thuc)) cay vanh dai cua su*.